Tuning Questions For Drag Racing

Bill_s351

Bill_s351

New Member
Aug 28, 2001
17
0
0
N. GA USA
#1
I hope these questions aren't too elementary. Here is my setup and list of mods.

90' coupe, stock T-5, stock 8.8 w/373 motorsport gears, X2C boxer upper and lower arms, 15x8 Draglites with 26/11.50/15 ET Streets @ 9-11psi.

306 w/ Summitt flat tops, stock rods and crank, windage tray, Mac Long tubes and H-pipe into 2 chamber Flows, E-303 cam, stock fuel rails and stock 19lb injecors, cheap adj regulator @ 39psi, 76mm BBK T/B, C&L Truflo elbow, C&L 73mm MAF, K&N conical filter, Holey Systemax II Upper and lower intake, Manley one piece chrom moly pushrods, Protopline 180cc cast heads with with 58 cc chambers, stainless 2.02 int & 1.600 ex vlaves, Motorsport 1.6 RR, valve springs upto .510 lift. The car's best 1/8th to date is 7.94 @86 with 1.62 60' This weekend the car sucked ass. The best I could pull off was an 8.35 @ 82 with a 1.90 60' time. I don't understand it all. It's like it just has laid down on me. I just installed a Spec stage II clutch and UPR triple hook quadranat and firewall adjuster. I'd like some opinions on tuning it for the strip. I know what we threw at it and it didn't work at all. I'm not a seasoned veteran at tuning, but I thought that we had it dialed in pretty well. I guess I was wrong. Sorry for the long post, but I'm very frustrated right now and grasping at straws at this point. Any and all help is appreciated. I don't drive this car much on the street, but it is very streetable. It gets 18 MPG with this setup. I know there isn't much that can been done tuning wise with this stock computer, but surely you guys have some advice. Timing, plug brand and gap, and fuel pressure to my knowledge is about it. Right? What would you guys adjust all of these items at?
Once again, sorry for the long post. I really value everyone's opinion on here. I don't post much, but I read the forums a lot.

Thanks
 
#3
i think you could ok w/ stock injectors, timing should be about 14*-16* where are you at?

fp sounds good too. your at the limit of the stock pump and inj right now, but the "best" et sounds right on the money.

and the et you recently ran is off from lack of traction. you lost 3 tenths of 60' that would equal 1/2 second 1/4 time et
 
#5
Timing was at 14* spout out. I'm sure you're right about the 60' times. I think I need to upgrade to a locker or mini spool or something. I never did get a good burnout. It was doing the one wheel bandit crap all day. The track seemed to be hooking pretty good for everyone else but me. I was really looking forward to some 7.60's or 7.70's this time out. Oh well....there is always next year I guess. I don't get to go to the track very much due to working so much. But, this winter I plan on pulling the motor to freshen it up a bit. I want to keep pretty much the same combo with the exception of injectors, fuel pump, MAF. I want to see how fast it will go on motor before I juice it. There is a lot of smack talk around here and I want to put an end to all the mouth and I want to do it N/A.:nice:

BTW....what plugs and gap to you guys use? I'm using Autolite 24's right now @ 38 thousandths. Is that cool?
 
#6
inj ready for an upgrade yes, too small right now, no. all stock will support about 300-325 hp. but starting to push it.
monitor the plugs is all u have to do.

i use stock plugs gapped at .035-.040 for 2 reasons.

1 cuz i spray, 2nd cuz i had trouble w/ plugs gapped at
.052

did you take any vid of your runs? i had a buddy that was going crazy cuz he couldn't hook, was doing a long burnout but too low rpm's. i watched hiim the first time and told him to bring the r's up, he wasn't even paying attention to it. just doing the burnout. when he brought it up to about 4k in 2nd gear, it hooked.
 
#7
notchback said:
inj ready for an upgrade yes, too small right now, no. all stock will support about 300-325 hp. but starting to push it.
monitor the plugs is all u have to do.

i use stock plugs gapped at .035-.040 for 2 reasons.

1 cuz i spray, 2nd cuz i had trouble w/ plugs gapped at
.052

did you take any vid of your runs? i had a buddy that was going crazy cuz he couldn't hook, was doing a long burnout but too low rpm's. i watched hiim the first time and told him to bring the r's up, he wasn't even paying attention to it. just doing the burnout. when he brought it up to about 4k in 2nd gear, it hooked.
Click to expand...

19lb/hr injectors are maxxed out around 305-315hp at the CRANK, not the wheels. Find some dyno charts of somebody with those heads, and any cam and intake.
 
#9
IntenseBlue said:
19lb/hr injectors are maxxed out around 305-315hp at the CRANK, not the wheels. Find some dyno charts of somebody with those heads, and any cam and intake.
Click to expand...

oh well then i guess everytime i was running 325 or so on stock pump and injectors i was lean. weird cuz it ran like a brick $h!thouse ?

your pretty smart for a guy w/ a stock 5.0 , when do you graduate high school?
 
#10
What H/C/I did you have? This is confusing the hell out of me. You were running 375 crank horsepower out of 19s and an 88lph fuel pump?

His heads flow 276cfm on the intake side. That's equivelant to AFR 185s. Never heard of anyone with 185s, a Holley Systemax, and any cam on stock fuel injectors, and especially not a stock fuel pump.

Do I detect sarcasm in that last line? BTW, I'm not trying to be an *******, just giving my opinion.
 
#13
Need more fuel big time... I have stock injectors and aftermarket pump, and run 40 psi with way less parts than you. Id say get some 24s and an aftermarket pump like suggested and tune it at the track, keep bringing FP up and see how it affects the times and mph!
 
#15
IntenseBlue said:
What H/C/I did you have? This is confusing the hell out of me. You were running 375 crank horsepower out of 19s and an 88lph fuel pump?

His heads flow 276cfm on the intake side. That's equivelant to AFR 185s. Never heard of anyone with 185s, a Holley Systemax, and any cam on stock fuel injectors, and especially not a stock fuel pump.

Do I detect sarcasm in that last line? BTW, I'm not trying to be an *******, just giving my opinion.
Click to expand...

at what part of this post was rwhp talked about as being our measurement of choice?

i'm not going to read over this thing again, but it wasn't to my knowledge. i have run 2 cars w/ stock motors and 100 shot of nitrous, that is 305 hp minimum. on stock fuel system. every base nitrous kit made is for 100 hp and use on 100% stock fuel system

i'm not counting any of the exhaust work which was long tubes, off road h, and 2 1/2 catback.

so i think 325 is a "fair" hp count , flywheel hp.

i'm not saying that he is not ready for a fuel upgrade, he is, what i'm saying is that fuel is not a problem that he ran slower than his best.

he ran quicker b4 w/ the same setup, so fuel cannot be an issue, unless something broke. we are not assuming something broke, neither is he, he wants to know why it ran slower plain and simple....if the fp is not tailing off under load, he is not lacking.....he obviously has a guage because he stated his fp. and i'm sure he would have noticed the guage fluctuating

i think that is pretty plain and simple, he was not ever asking how to, or where to improve his et, or fuel system , simply why it differed from his previous best.

sarcasm ? most definitely yes.
 
#17
notchback said:
at what part of this post was rwhp talked about as being our measurement of choice?

i'm not going to read over this thing again, but it wasn't to my knowledge. i have run 2 cars w/ stock motors and 100 shot of nitrous, that is 305 hp minimum. on stock fuel system. every base nitrous kit made is for 100 hp and use on 100% stock fuel system

i'm not counting any of the exhaust work which was long tubes, off road h, and 2 1/2 catback.

so i think 325 is a "fair" hp count , flywheel hp.

i'm not saying that he is not ready for a fuel upgrade, he is, what i'm saying is that fuel is not a problem that he ran slower than his best.

he ran quicker b4 w/ the same setup, so fuel cannot be an issue, unless something broke. we are not assuming something broke, neither is he, he wants to know why it ran slower plain and simple....if the fp is not tailing off under load, he is not lacking.....he obviously has a guage because he stated his fp. and i'm sure he would have noticed the guage fluctuating

i think that is pretty plain and simple, he was not ever asking how to, or where to improve his et, or fuel system , simply why it differed from his previous best.

sarcasm ? most definitely yes.
Click to expand...

He should be making more than 325 at the crank. You didn't mention rwhp. I did. I said they were maxxed out at 315 at the crank, not the wheels. You said it was OK when you ran 325. I assumed you meant the wheels. I told him that because it was helpful information. He asked about fuel pressure. He says he's running 39psi. Alot of people run that psi on stock injectors with alot less mods than him. Instead of increasing fuel pressure, I suggested 24s, or maybe even 30s, though I think 30s would be too large.

As for the original poster, your time slowed because of your 60ft. Was it spinning more, or just slower all-around. New clutch could have alot to do with it, not that it's bad, but it might need to be launched a different way. I can't tell you how to launch it, but I imagine it grabs differently than the stock clutch does. Either that, or your compression leaking would be my next guess.
 
#18
Wow! A lot of information there to take in. As far as the injectors, well, I'd say I'd have to agree to an upgrade. I've been wanting to see how far I could go without additional mods, but I'm sure the 24's would be a good idea.
As far as the 60' times, well the one wheel bandit stuff I'm sure didn't help much to keep the 60's where they should be. My launching techniques were varied to different RPM's trying to find the sweet spot with this new clutch. Also, I didn't mention that on the drive home from the track, I noticed a very distinct lifter pecking noise. The oil pressure was good all day. so I'm not sure what thats all about. I think that might be another factor for it slowing down. I don't know yet. I'd like to put a locker in the rear and see what happens after I freshen the 306 with new rings, bearings, etc.
My main question for this thread was about tuning?
It sounds like there are several opinions on the fuel system, but I'd like to know more details about the whole tunning idea in general.

Thanks for the feedback and keep it coming.

Thanks.
 
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